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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6fdc7d339390cf1be8c1c6667fd5c04db1a7c0b428aa885a3b5e11d92ef82a' 
  AND token = '0eka4SLOohjEiS9XKrb86nBNmCnKBPJqjLPBw0VckWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}